Furnace



Nov. 15, 1927. 1,649,648

- H. BANGERT FURNACE Filed June 1926 2 Sheets-Sheet l v 6 WITNESSES INVENTOR wa /ma W Nov. 15,, 1927. 1,649,648

H. BANGERT FURNACE Filed June 9. 1926 2 Sheets-Sheet 2 WITNESSES .INVENTOR fl w M W Patented Nov. 15, 1927.

' UNITED STATES PATENT OFFICE.

HEImgIoH BANGERT, or DUSSELDOBF, GERMANY.-

FURNACE.

Application filed June 9, 1926. Serial No. 114,660.

The invention relates to continuous heating furnaces of the type in which a furnace is provided at one end with a charging and at its other end with a discharging opening,

the material to be heated being placed in the furnace through its. chargin opening and progressively moved throu'g the furnace toward and to its discharging opening, and the material being heated. while in and so moved through the furnace. While the invention may be used in continuous furnaces for heating different kinds of material, it is particularly applicable to furnaces for heating sheet bars for rolling into sheet metal.

An object of the invention is to provide a furnace of thetype explained in which provision is made for introducing fuel gas at or adjacent to the charging end of the furnace,

. and for producing maximum heating eifect at or adjacent to the discharge end, the heatingueffect progressively. diminishing from the discharging to the charging'end of the furnace. l

-A further object'is to provide a furnace in which fuel gas is introduced ator adjacent to the charging end of the furnace, and in which provision. is made for heating auxiliary' air for combustion, which-air is mixed with the fuel gas at or adjacent to the dischar e end of the furnace to effect maximum heatmg in that region.

The invention is illustrated in the accompanying drawings, of which Fig. 1 is a vertical central sectional View through a continuous heating furnace; Fig. 2 a transverse vertical sectional view taken on the l ne II-II, Fig. 1; Fig. 3 a horizontalv sectional view taken on the line IIIIII, Fig. 1; and Figs. 4: and 5 vertical sectional views similar to Fig. l'showing modifications of construction.

Having reference first to'the embodiment of the invention illustrated in Figs.. 1, 2 and 3, there is shown a furnace having end walls 1 and 2, side walls Sand 4, a top 14, and a bottom 5, the bottom being provided with suitable supports or skids 6 for supporting sheet bars or other blanks to beheated, which blanks are placed in the furnace through a charging opening 8 in its end wall 1 and removed from the furnace through a discharg ing opening 9 in its end wall 2. These furnace openings are normally closed by suitable blocks 10 and 11, the construction and operation of which are well known to those skilled in the art. Side wall 4 is provided with a fuel gas inlet 12 which may, andpreferably does, lead from a gas producer arranged adjacent to this inlet, although it will be understood that fuel gas may be supplied from a source otherwise located.

Between the top 14 and bottom 5 of the furnace there is a horizontally disposed arched wall or mufile 15 extending from one side wall to the other and from front wall 1 towards rear wall 2. This wall 15 forms with side walls 3 and 4 above it, and with the top of the furnace, a passageway 16 for the fuel gas which enters inlet 12. When this fuel gas comes from a gas producer arranged.

adjacent to the charging end of the furnace it is heated and preferably in a state of partial combustion, although as far as concern some features-of the invention no further combustion need take place. It flows towards the discharging end of the furnace in the direction indicated by arrows 17, and at the end of wall 15 it turns downwardly and flows toward the charging end of the furnace, as also indicated by these arrows.

At the end of wall 15, where the fuel gas turns downwardly, a supply of auxiliary air is mixed with the fuel gas so that the maximum heating effect of the gas isin the zone or region of the discharge end of the furnace. This auxiliary air may be supplied through passageways 20' formed in wall 15, the passageways having outlets at the end of this wall and having inletscommunioating with an air supply duct 21 in end wall 1 at the charging end of the furnace. Duct 21 may lead from a recuperator, or from any. other source of air supply, the air being either at atmospheric temperature or being preliminarily heated. As the auxiliary air flows through passageways 20 in wall 15 it becomes heated so thatwhen it is mixed with the fuel gas at the end of the wall a maximum heating effect is produced.

So that the productsof combustion as they flow from the zone of maximumheating efi'ect adjacent to the discharging end of the furnace maynniformly heat all portions of blanks 7, skids 6 are preferably elevated above furnace bottom 5 by means of refractory ribs 22. By so supporting the blanks above the-furnace bottom, passageways for the products of combustion are formed below and at the sides of the-blanks as wellas above them. At the charging end of the furnace, wa1l5 is provided with a port 25 through which the products of combustion flow downwardly into a passageway 26 which communicates through a port 27 with a passageway 28 leading either directly to a stack or to and through a recuperator for preliminarily heating air or fuel gas.

In the embodiment of the invention illus-' trated in Fig. 4, the furnace is constructed the same as shown in Figs. 1, 2 and 3, except that in the Fig. 4 form wall is'not provided with passageways for the introduction and preliminary heating of auxil iary air. In lieu of this, auxiliary air issupplied through a series of passages 30 arrangedin the furnace top 14 and leading from an air duct 31 arranged above the top of the furnace. Duct 31 may lead from any suitable air supply, as for example from a recuperator in which the air is preliminarily heated. Passages 30 so direct the auxiliary air into the fuel gas entering the furnace through inlet 12 that the auxiliary air meets the fuel gas adjacent to the end of wall 15 to producemaximum heating effect in the discharge region ofthe furnace.

In the embodiment of the invention illustrated in Fig. 5, muffle wall 15 is provided adjacent to its end with a plurality of vertically disposed passages 35 through which fuel gas may flow downwardly through the wall. In this embodiment of the invention,

' auxiliary air is supplied to the furnace heating chamber through passages 36 in the furnace top 14= adjacent to the rear furnace wall 2". Passages 36 lead from an air duct 37, which in turn may lead from a recuperator or any other-source of air supply, and control of air from duct 37 through passages 36 may be effected by suitable dampers 38.

It is characteristic of each of the several char'gingand a discharging end and a top embodiments of the invention that fuel gas enters the furnace through an inlet at the charging end, that it then flows towards the discharging end of the furnace where it is supplied with auxiliary air to effect maximum heating in the region of the discharge end of the furnace, and that the products of combustion then flow towards the charging end of the furnace on all sides of the.

blanks being heated. In this way the hottest blanks are subjected to, the maximum effect and the cooler blanks adjacent to the charging end of the furnace are heated by products of combustion whichare not as hot as at the zone of maximum heating.

Accordin to the provisions of the patent statutes, I aveexplained the principle and operation of my invention, and have illustrated and described several embodiments of it. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced by other forms of construction than those particularly illustrated and described.

I claim as my invention:

1. A continuous heating furnace having a charging and a discharging end and a top and bottom, a wall below the furnace top extending from the charging toward the discharging end of the furnace, a fuel gas inlet adjacent to the charging end of the furnace and above said wall, and passageways extending longitudinally through said wall for supplying heated auxiliary air to the-fuel gas adjacent to the discharging end of the furnace.

2. A continuous heating furnace having a charging and a discharging end and a top and bottom, a wall below the furnace top extending from the charging toward the discharging end of the furnace, a fuel gas inlet adjacent to the char ing end of the furnace and above said wa 1, and an outlet for products of combustion below said wall and adjacent to the charging end of the furnace.

3. A continuous heating furnace having a charging and a discharging end and a top and bottom, a wall below the furnace top extending from the charging toward the. discharging end of the furnace, a fuel gas inlet adjacent to the charging end of the furnace and above said wall, an outlet for products of combustion below said wall and adjacent to the charging end of the furnace, and blank-supporting skids extending longitudinally of. the furnace elevated above the furnace bottom to form passages for products of combustion above, below and at the ends of blanks supported on the skids.

4;. A continuous heating furnace having a and bottom, a wall below the furnace top extending from the charging toward the discharging end of the furnace, a fuel gas inlet adjacent to the charging end of the furnace and above said wall, passageways extending longitudinally through said wall for supplying heated auxiliary air to the fuel gas adj acent to the discharging end of the furnace, an outlet for products of combustion below said wall and adjacent to the charging end of the furnace, and blank-supporting skids extending longitudinally of the furnace elevated above the furnace bottom to form passages for products of combustion above, below and at the ends ofblanks supported on the skids.

In testimony whereof, I hereunto sign my name.

HEINRICH BANGERT. 

